The utility model discloses an automatic precision measuring device with a pressure sensor. Including a base, the base is provided with a carrying platform, a guide rail, a movable measuring jaw and asingle-chip microcomputer. The movable measuring jaw is installed on the guide rail and slides along the guide rail. A pressure sensor is arranged on one side in the carrying platform; a contact plate covers the pressure sensor; the movable measuring jaw is controlled by a stepping motor; the pressure sensor and the stepping motor are in signal connection with the single-chip microcomputer. The movable measuring jaw extrudes an object to be measured to contact the contact plate of the object carrying platform, the pressure sensor measures the pressure on the contact plate and transmits a signal to the single-chip microcomputer through the pressure sensor driving module, and the single-chip microcomputer controls the stepping motor according to the pressure signal so as to control the movement of the movable measuring jaw. According to the utility model, the pressure between the movable measuring jaw and the contact surface of a measured object during measurement can be accurately controlled, the operation is simple, the measurement is automatic, and the measured data is accurate.